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The strarting procedure is much the same for all chainsaws/power cutters, switch the ignition on, pull the choke fully out, depress the deco valve if it has one, lock the half throttle button if fitted, crank the engine until it fires once ( it will not run at all on choke ), do not continue to crank after the first fire or you will flood it, push the choke fully back in, crank the engine until it starts.

Check the carb fuel stub to see if its seated in the hose. Chech to see if you re-installed the piston underside scavenge hose to the bottom stub of the carb. Check your compression. New is 160 psi, operational but problematic (hard start) 130~140 and completely toast at 90. This saw is easy to flood when compression has fallen off. Cold start, 3 pulls choke on with the throttle trigger locked wide open. At first sputter, put choke in normal run and it should fire by the 3rd pull. If not its flooded. Then remove the plug and with an air hose vacate the cylinder of fuel for a few minutes and try again without the choke or throttle lock set at wide open.

First of all, make sure you have followd the correct start up procedure.
(1)Throttle on and locked in start position, (2)choke on and pull a few times. Saw should fire briefly and cut out. (3)Now switch to idle (half choke if applicable) and pull another couple of times. Saw should now fire and run. If you have pulled it too many times in the full choke position you will have flooded the engine. To rectify this you will need two people. One of you should hold the machine steady on the ground with no choke on and throttle fully open. The other should also steady the machine and pull the starter in quick succesion. This could take ten or so pulls but it should start the engine in the case of flooding. Sometimes it will splutter a couple of times before fully starting and it will normally bog down a bit for the first few seconds as it spits out the excess fuel/oil mix.
If you got to point (3) as it shown above, and then the saw wouldn't start, or hadn't fired and died then there could be a few different problems. basic checks are for, clean filter, fresh/clean fuel, clean spark plug (ie, not oily/choked with carbon build up). When checking the spark plug, if it has fuel/oil mix on it then ther is probably aeither a compression problem/air leak or no spark. To check for a spark leave the plug unscrewed but fitted into cap, rest it against a metal part of the saw and pull the starter with the elec switch on. You should see a healthy blue spark. WARNING, do not rest the spark plug near the plug hole as if it does spark it could ignite any fuel/oil mix that is pumped out of the cylinder. I've had many a singed eyebrow from this happening. If there is no spark, check to make sure the cap is attatched securely to the lead,and try repacing the plug. If this doesn't help you will need to get the coil, ht lead and wiring tested.